Spiraea &#39;DAVROU01&#34;

ABSTRACT

‘DAVROU01’ is a new cultivar of hybrid Spiraea with distinctive dark red-purple new foliage and stems. Plants are compact and bloom continuously throughout Spring and Summer. The new variety is a Spiraea normally produced as an outdoor garden or container plant.

Latin name of the genus and species: Spiraea bumalda x japonica.

Title: Spiraea ‘DAVROU01’.

BACKGROUND OF THE INVENTION

The present invention comprises a new and distinct hybrid Spiraeacultivar hereinafter referred to by the cultivar name ‘DAVROU01’. Thisnew Spiraea was developed through a breeding program in Angers, France.‘DAVROU01’ was selected from a population of seedlings grown from acontrolled cross of Spiraea ‘Denistar’, U.S. Plant Pat. No. 22,432 asthe seed parent and Spiraea japonica ‘Bailcarol’, unpatented, as thepollen parent. The first asexual propagation of ‘DAVROU01’ was carriedout in July 2014 by rooting stem cuttings at a research nursery inAngers, France, and has been asexually reproduced repeatedly byvegetative cuttings over a 5-year period. ‘DAVROU01’ has been found toretain its distinctive characteristics through successive asexualpropagations.

SUMMARY OF THE INVENTION

The following are the unique combination of characteristics of this newcultivar when grown under standard horticultural practices at a researchgreenhouse in Angers, France.

-   -   1. Very compact plants.    -   2. Dark red-purple new foliage and stems.    -   3. Some resistance to powdery mildew.

COMPARISON TO PARENTAL VARIETIES

‘DAVROU01’ is similar to its female parent in most horticulturalcharacteristics, however, the new variety differs in the following:

-   -   1. Coloration of the new foliage of ‘DAVROU01’ is greyed-purple,        coloration of the new foliage of ‘DENISTAR’ is red to        greyed-red.    -   2. Mature foliage color of the new variety is darker green than        mature foliage color of the seed parent.    -   3. Flowering stems of the new variety are a darker red than        flowering stems of the seed parent.

‘DAVROU01’ is similar to its male parent in most horticulturalcharacteristics, however, the new variety differs in the following:

-   -   1. Coloration of the new foliage of ‘DAVROU01’ is greyed-purple,        coloration of the new foliage of ‘BAILCAROL’ is light red.    -   2. Mature foliage color of the new variety is dark green, mature        foliage color of the pollen parent is yellow-green.    -   3. Flower color of the new variety is darker pink than flower        color of the pollen parent.

COMPARISON WITH COMMERCIAL CULTIVARS

‘DAVROU01’ can be compared to the commercial variety Spiraea ‘AnthonyWaterer’, unpatented. The two Spiraeas are similar in most horticulturalcharacteristics. The new variety, however differs in the following:

-   -   1. The new variety is more compact, approximately 50% smaller        than ‘Anthony Waterer’.    -   2. Mature foliage color of the new variety is darker green than        that of ‘Anthony waterer’.    -   3. Coloration of the new foliage of ‘DAVROU01’ is greyed-purple,        coloration of the new foliage of ‘Anthony Waterer’ is light        greyed-red.

BRIEF DESCRIPTION OF THE DRAWINGS

This new Spiraea is illustrated by the accompanying photographs whichshow the plant's form, foliage and inflorescences. The colors shown areas true as can be reasonably obtained by conventional photographicprocedures. Colors in the photographs may differ slightly from the colorvalues cited in the detailed botanical description, which accuratelydescribe the colors of the new hybrid Spiraea.

FIG. 1 is a color photograph showing the emerging foliage of ‘DAVROU01’in Angers, France. The plant is approximately 2.5 years old, planted inthe ground.

FIG. 2 is a close-up view of the emerging foliage of the same plant asFIG. 1.

FIG. 3 is a color photograph showing a inflorescences and mature foliageof ‘DAVROU01’ in Angers, France.

DETAILED BOTANICAL DESCRIPTION

The following is a detailed description of the botanical characteristicsof the new and distinct hybrid Spiraea known by the denomination‘DAVROU01’. The detailed description was taken on a three-year-oldfield-grown plant in Angers, France. All colors cited herein refer toThe Royal Horticultural Society Colour Chart (The Royal HorticulturalSociety (R.H.S.), London, 2007 Edition. Where specific dimensions,sizes, colors, and other characteristics are given, it is to beunderstood that such characteristics are approximations or averages setforth as accurately as practicable.

-   Classification: Botanical name: Spiraea bumalda x japonica    ‘DAVROU01’.-   Plant description:    -   -   Habit.—Rounded/mounded woody deciduous shrub.        -   Height.—About 60 cm.        -   Width.—About 80 cm.-   Branches: Average 4 per main stem.    -   -   Lateral branch diameter.—1 to 1.4 cm.        -   Lateral branch length.—30 to 50 cm.        -   Internode length.—1 to 2 cm.        -   Branch color.—Immature: Red-Purple 59A. Mature:            Greyed-Purple 183A.        -   Branch texture.—Finely striated.-   Leaves:    -   -   Type.—Simple.        -   Persistence.—Deciduous.        -   Arrangement.—Alternate.        -   Shape.—Ovate.        -   Apex.—Acute.        -   Base.—Acute.        -   Venation.—Pinnate.        -   Vein color.—Emerging leaves, upper and lower: Red-Purple            59A. Mature leaves: Upper surface Green 133B, lower surface            133B.        -   Margins.—Serrate.        -   Color.—Emerging leaves, upper and lower: Red-Purple 59A.            Mature leaves: Upper surface Green 137A, lower surface 133B.            Texture: Glabrous. Length of lamina: Width:        -   Leaf attachment.—Petiolate.        -   Petiole.—Length: 0.2 cm. Diameter: less than 0.1 cm. Color:            Emerging leaves: Red-Purple 59A. Mature leaves: Green 133B.            Texture: Glabrous.-   Inflorescence:    -   -   Description.—Single whorled, rotate flowers arranged on a            terminal corymb.        -   Number of flowers per inflorescence.—About 200.        -   Flowering season.—Spring and Summer in Angers, France.        -   Inflorescence diameter.—6-8 cm.        -   Inflorescence height.—About 4 cm.        -   Bud.—Shape: Globular. Length: about 2 mm. Diameter: about            2 mm. Color: Red-Purple 64C.        -   Flower.—Diameter: about 5 to 7 mm. Height: About 2 mm.            Flower aspect: Upward and outwardly facing.        -   Petal.—Arrangement: Whorl. Number: 5. Fused: Not fused.            Texture: Glabrous, all surfaces. Shape: Orbicular. Margin:            Entire. Apex: Obtuse. Base: Obtuse. Length: 2 to 3 mm.            Width: about 2 mm. Color when opening: Red-Purple 64C. Color            at anthesis: Red-Purple 64C, fading to Red-Purple 65D in            center.        -   Calyx.—Shape: Cup-shaped with five lobes. Length: About            3 mm. Diameter: About 2 mm.        -   Sepal.—Arrangement: Single whorl. Number: 5. Texture:            Pubescent along margins. Shape: Acute. Margin: Entire. Apex:            Acute. Base: Fused. Color: Near Green 133B. Length: About            1.3 mm. Width: About 0.7 mm.        -   Peduncle.—Length: About 1.5 to 3.5 mm. Diameter: About 8 to            10 mm. Color: Near Red-Purple 59A. Texture: Pubescent.        -   Pedicels.—Length: 3 to 5 mm. Diameter: About 1 mm. Color:            Near Red-Purple 59B. Texture: Glabrous to lightly pubescent.-   Reproductive organs:    -   -   Gynoecium.—Pistil number: 5. Pistil length: 3 mm. Stigma            shape: linear. Stigma color: Near Red-Purple 59A. Style            length: 2 mm. Style color: Near Red-Purple 59B. Ovary color:            Near Yellow-Green 144C.        -   Androecium.—Stamen number: 10 to 20.Anther shape: Linear.            Anther size: 2 mm. Anther color: Near Red-Purple 59C.            Filament length: 4 to 6 mm. Filament color: Near Red-Purple            59D. Amount of pollen: Moderate. Pollen color: White 155C.-   Other:-   Fruit and seed: Not observed to date.-   Disease and insect resistance: Some tolerance for powdery mildew    observed. Neither resistance nor susceptibility to other normal    diseases and pests has been observed.-   Temperature tolerance: USDA Zones 4 to 8. Cold hardy to at least    −25C.°

What is claimed is:
 1. A new and distinct hybrid Spiraea plant named‘DAVROU01’ substantially as illustrated and described herein.